Final answer:
Approximately 120,000 Japanese Americans were interned in camps during World War II due to Executive Order 9066 post the attack on Pearl Harbor.
Explanation:
Approximately 120,000 Japanese Americans were forced to live in internment camps during World War II due to Executive Order 9066 signed by President Roosevelt post the attack on Pearl Harbor. This action was fueled by wartime anti-Japanese sentiment and resulted in the relocation of over 110,000 individuals, the majority being U.S. citizens. Many of these Japanese Americans faced unjust detention in camps despite their loyalty to the United States.
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